BVM-A20F1M Sega consoles Sync problems

[jwrose]

if thats so then the issue with the MVS can be timing, since that has the same refresh rate. it has to be the sync pulse. but when i use my MVS the monitor goes into 576i50 mode like its confused

whats issues with yours aes did you have?

It was flagging (top of image was pushed to the right). SERR on my EXTRON RGB solves it.

if you culd somewhen confirm it is 24.00mhz crystal that would be apreciated, we need to start documenting properly things like this for future users

I’ll try to pop it open this weekend.

[jwrose]

if thats so then the issue with the MVS can be timing, since that has the same refresh rate. it has to be the sync pulse. but when i use my MVS the monitor goes into 576i50 mode like its confused

whats issues with yours aes did you have?

It was flagging (top of image was pushed to the right). SERR on my EXTRON RGB solves it.

if you culd somewhen confirm it is 24.00mhz crystal that would be apreciated, we need to start documenting properly things like this for future users

Ha, so I popped it open and realized I had no idea what I was looking for. Any help on how to find the crystal frequency?

[Ryoandr]

You need to find crystal that look like this :


There are 2 in AES, 1 is 3.57mhz for video circuit, other is ~24mhz (AES should have above 24mhz as they tried to get closer to NTSC timing).

You can find most revisions pics here
https://wiki.neogeodev.org/index.php?title=AES_hardware

[Saturngamer81]

[/quote]


Ha, so I popped it open and realized I had no idea what I was looking for. Any help on how to find the crystal frequency?[/quote]


take a picture of the board, or several if you are unsure

[jwrose]

You need to find crystal that look like this :


There are 2 in AES, 1 is 3.57mhz for video circuit, other is ~24mhz (AES should have above 24mhz as they tried to get closer to NTSC timing).

You can find most revisions pics here
https://wiki.neogeodev.org/index.php?title=AES_hardware

OK, so I looked at the boards, definitely the first known board type variant. The one thing that I did find a bit weird compared to the photos on neogeodev.org is I have an empty spot where one of the crystals goes (If I'm understanding it correctly). Anyway, I took photos of that spot (where there's clearly a place on the board for it) what appeared to be another crystal, and a few other general photos. Mine has been modded twice. The first modder put in the bios chip in the early 2000s as well as an s-video and stereo out mod (this was prior to me owning it). Second mod was last year where I got a recap and the s-video and audio mods were removed by the recommendation of my modder (they were quite a mess!). I just use SCART now anyway and just use the front audio jack for my audio.

https://ibb.co/f1kyxg2
https://ibb.co/7WTBkP6
https://ibb.co/XXhG3CH
https://ibb.co/T0nJFc9

Let me know if you need any other photos or clarification.

UPDATE: I totally missed what appears to be a second crystal on the little daughter board on the one side. Its visible on the top of the 4th photo

[Saturngamer81]

You need to find crystal that look like this :


There are 2 in AES, 1 is 3.57mhz for video circuit, other is ~24mhz (AES should have above 24mhz as they tried to get closer to NTSC timing).

You can find most revisions pics here
https://wiki.neogeodev.org/index.php?title=AES_hardware

OK, so I looked at the boards, definitely the first known board type variant. The one thing that I did find a bit weird compared to the photos on neogeodev.org is I have an empty spot where one of the crystals goes (If I'm understanding it correctly). Anyway, I took photos of that spot (where there's clearly a place on the board for it) what appeared to be another crystal, and a few other general photos. Mine has been modded twice. The first modder put in the bios chip in the early 2000s as well as an s-video and stereo out mod (this was prior to me owning it). Second mod was last year where I got a recap and the s-video and audio mods were removed by the recommendation of my modder (they were quite a mess!). I just use SCART now anyway and just use the front audio jack for my audio.

https://ibb.co/f1kyxg2
https://ibb.co/7WTBkP6
https://ibb.co/XXhG3CH
https://ibb.co/T0nJFc9

Let me know if you need any other photos or clarification.

UPDATE: I totally missed what appears to be a second crystal on the little daughter board on the one side. Its visible on the top of the 4th photo

cant seem to open the images,, are the addresses ok?

[jwrose]

cant seem to open the images,, are the addresses ok?

Try again- I think the service was having issues. They worked fine then I also had problems in the last few minutes then they started working again

[Ryoandr]

The crystal of interest is the one on the daughterboard, unfortunately markings are under a blob of solder :p

[Saturngamer81]

The crystal of interest is the one on the daughterboard, unfortunately markings are under a blob of solder :p

you can see the 2 at the begining and a 9 at the end.... i reckon its the 24.167829 crystal,,,

[jwrose]

The crystal of interest is the one on the daughterboard, unfortunately markings are under a blob of solder :p

Ha I was afraid you’d say that. Any thoughts as to if that was original or added by a modder for some purpose? I know my friend I had do it didn’t add that since I do have a low res image he sent me of how it looked when he opened it- and that was already there.

[Saturngamer81]

The crystal of interest is the one on the daughterboard, unfortunately markings are under a blob of solder :p

Ha I was afraid you’d say that. Any thoughts as to if that was original or added by a modder for some purpose? I know my friend I had do it didn’t add that since I do have a low res image he sent me of how it looked when he opened it- and that was already there.

could of been a refurbished model, i still cant confirm if any of the aes revisions even had a 24.00 crystal since most images of a first revision board are blurry. but at least we know that the so called revised crystal works with the 68x with help of an extron,,,,

my solution for the MS was to mod a cable so that the scart to bnc RGB lines go straight to my cross point and the rgb line is modded with a db15 into the extron rgb then out puts to the crosspoint, this preserves the RGB signal lines meaning only the sync is processed by the extron RGB,, just wanted to put that out there.

[Ryoandr]

you can see the 2 at the begining and a 9 at the end.... i reckon its the 24.167829 crystal,,,

dang, good eyes

Ha I was afraid you’d say that. Any thoughts as to if that was original or added by a modder for some purpose? I know my friend I had do it didn’t add that since I do have a low res image he sent me of how it looked when he opened it- and that was already there.

So it seems the 24.167829 crystal was there from the start of AES in any case.

[Saturngamer81]

[Saturngamer81]

you can see the 2 at the begining and a 9 at the end.... i reckon its the 24.167829 crystal,,,

dang, good eyes

Ha I was afraid you’d say that. Any thoughts as to if that was original or added by a modder for some purpose? I know my friend I had do it didn’t add that since I do have a low res image he sent me of how it looked when he opened it- and that was already there.

So it seems the 24.167829 crystal was there from the start of AES in any case.

the revision with the crystal near the video out section on this could well be the revision with the 24,00 but its to blurry

https://wiki.neogeodev.org/index.php?ti ... -AES_board

[daty2k1]

Anyone with a MiSTer was able to get sync from the Arcade cores ? This is the last thing that I can't get to work on the A Series. The only one that works out of the box is Section Z.

I wonder if an Extron could solve this.

[Saturngamer81]

Anyone with a MiSTer was able to get sync from the Arcade cores ? This is the last thing that I can't get to work on the A Series. The only one that works out of the box is Section Z.

I wonder if an Extron could solve this.

Which cores do work? i mean i presume the basic consoles do,, I think that the arcade cores have allot of odd timings see here https://github.com/MiSTer-devel/Main_Mi ... patibility

[daty2k1]

All consoles cores work fine. But it doesn't seem to like all the different refresh rates of the arcade boards. I managed to make CPS1 work in 480p but it doesn't look as good

[Saturngamer81]

All consoles cores work fine. But it doesn't seem to like all the different refresh rates of the arcade boards. I managed to make CPS1 work in 480p but it doesn't look as good

when i get mine ill put it through its paces, i have several extron devices if need be. so we can share solutions , problems etc.

[daty2k1]

Cool thanks

[daty2k1]

I finally received my PAL PS1 modded with a dual oscillator and unfortunately, it still doesn't work... Both with the PSIO and an original game. My last resort now is the NTSC motherboard that I got on eBay. I already tested it before and it's working fine for NTSC games so I guess I'll just have to get it modded for PSIO now. I still have multiple PAL models so if I ever want to get some 50Hz goodness, it's still possible but I'm really disappointed.

I also have a dual oscillator in my Japanese N64 now but a quick test with the Everdrive and a PAL game still doesn't sync. I suspect this is because the Everdrive is seen as an NTSC game and the oscillator doesn't switch because it stays in 60Hz. I still need to test it with a real PAL cartridge to make sure.

The good news is that I got my PAL Saturn modded with region free + 60Hz switch and everything is working great. Did a quick test with Sega Rally PAL in 50Hz and 60Hz and I had no issue. I'm waiting on my MODE now.

Edit: N64 works fine with a PAL cartridge. Maybe there's a way to force it on the Everdrive but it's not a big deal.

[daty2k1]

OK huge update (even though I'm mostly talking to myself here ). I was so pissed about that PS1 not working that I checked the original forum thread about the DFO and the installation procedure to make sure that it was installed correctly. And sure enough, one wire was not at the right place.

Took out my soldering iron and some courage since it's clearly a step above my current level and voilà. It's now working perfectly!

Spoiler

[PeterWar]

I've noticed that the OSSC+ADC+HDMI to YpBpR combo has added one issue when playing The House of the dead 2 in my NTSC dreamcast, guns are slightly unaligned. Recalibrating the guns does not help. Does not appear to affect my modded RGB NES playing duckhunt though. Reverting to simply using the BKM68X in RGB mode and external sync on my BVM-A20F1M solves the issue.

[marujimmy]

hi did anyone seen this video? seems she resolve the sync issue on BVM-D14H5E , and verify on PC-E and another console
https://youtu.be/nYCdDzov420

[jwrose]

hi did anyone seen this video? seems she resolve the sync issue on BVM-D14H5E , and verify on PC-E and another console
https://youtu.be/nYCdDzov420

Oh cool- thanks for posting this, I hadn’t seen it. I guess this could simplify my setup because I could remove my Extron RGB if I get some of my cables modded like that. If that works for PC Engine, the same thing may work for the Neo Geo AES as well.

[daty2k1]

Too bad I don't have the 2 components on hand otherwise I would try it. I wonder if it can negatively affect consoles which were working fine without it though I suppose it shouldn't.

If you have a scart switch, the best would be to mod the cable coming out of the switch so that you only have to do it once.

[RGB0b]

hi did anyone seen this video? seems she resolve the sync issue on BVM-D14H5E , and verify on PC-E and another console
https://youtu.be/nYCdDzov420

As a note, that circuit seems to be fine for BVM's, but I woudn't try it on other devices. It also seemed to shift the image over quite a bit, so you might want to pick up one of these: https://www.aliexpress.com/item/4001070231745.html

...or heck, try and hack that circuit into that device. I think it's based off of this: http://members.optusnet.com.au/eviltim/other/other.htm

Another alternative would be to use the SCA101 switch I just reviewed. That thing is pretty cool: https://youtu.be/KeMPPyJAM_w

[PeterWar]

hi did anyone seen this video? seems she resolve the sync issue on BVM-D14H5E , and verify on PC-E and another console
https://youtu.be/nYCdDzov420

Another alternative would be to use the SCA101 switch I just reviewed. That thing is pretty cool: https://youtu.be/KeMPPyJAM_w

Interesting, how would a SCA101 fix these sync issues?

I just bought a JPN Megadrive 1 and I can confirm that it works very well with my BVM-A20F1M and BKM-68x. I can also play mega CD games. But mega everdrive master system games show the skew issue. I know the new gscartsw could be a solution for this skew issue, but has anyone tried if it solves the RGB Neo Geo skew issue as well? if so I would buy the newest version.

[RGB0b]

hi did anyone seen this video? seems she resolve the sync issue on BVM-D14H5E , and verify on PC-E and another console
https://youtu.be/nYCdDzov420

Another alternative would be to use the SCA101 switch I just reviewed. That thing is pretty cool: https://youtu.be/KeMPPyJAM_w

Interesting, how would a SCA101 fix these sync issues?

I just bought a JPN Megadrive 1 and I can confirm that it works very well with my BVM-A20F1M and BKM-68x. I can also play mega CD games. But mega everdrive master system games show the skew issue. I know the new gscartsw could be a solution for this skew issue, but has anyone tried if it solves the RGB Neo Geo skew issue as well? if so I would buy the newest version.

It wouldn't fix the sync issues, it would just help center the image after implementing the sync filter Maddie created.

[jwrose]

So, I may have a new one here. At least, I haven't run across it before online. I had my N64 RGB modded and it works great on my D Series BVM. I decided to run through all my games the day I got it hooked up. Interestingly, games that change resolution exhibit the same types of issues as the AES and PCE. Perfect Dark, once you get past the title screen, does it. Running it through the Extron RGB fixes it (just like with the AES and PCE). Also, Resident Evil 2, with the expansion pack, increases resolution for some things and causes the issue only on cut scenes and the inventory screen (about 80% of the time- other times the inventory loaded without issue?!). Its totally playable this way, or I can pop out the expansion pack and play it at 240p without issue.
Out of the 9 N64 games I have, those are the only ones that did that. From what I saw online, none of the others ran at different resolutions / switched resolutions. (i.e. games that had no issue were Mario 64, Smash, OoT, Mace, J2, 007, and Rouge Squadron).
Anyone else ever see this issue? It just seems odd because these should have just been resolution changes- but something about the signal is off apparently, too?

Oh, and Chrono Cross on PS1 doesn't cause this issue for me on my BVM- as I know that's a famous example of resolution swapping that causes issues with other hardware.

[daty2k1]

I have no issue with the N64 as long as I play NTSC games on an NTSC console and PAL games on a PAL console.

What kind of RGB mod do you have ? Mine uses the basic RGB mod with THS7374.